Assessment of different turbulence models on the large scale internal heated water pool natural convection simulation

Wei, Hongyang; Chen, Yitung

doi:10.1016/j.anucene.2019.03.018

Cited by 15 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite a higher speed value than reported in previous studies, the used material supported the blood-induced viscous stress in the three configurations of the pores. As the size of the pore increased, the decreasing tendencies in all the physical properties showed significant improvements, resulting in permeability enhancement [17][18][19]. It is interesting to observe that the pressure drops as low as 300 µm for PLA, while PEI turns out to be the highest of all.…”

Section: Selection Of the Fsi Calculation Methodsmentioning

confidence: 95%

“…To simulate the effect of the loading conditions, the scaffold was introduced in a prism whose dimensions fit the scaffold (Figure 2c). Physical properties that reproduce the bloodstream regarding density and viscosity were simulated inside the prism (at a density of 1074 Kg/m 3 , as the blood density is within the range of 1056 and 1088 Kg/m 3 and a dynamic viscosity of 3.5×10 −3 Pa•s) [18,19,34]. The mechanic properties of the scaffold material were empirically obtained from the tensile test, which allowed us to establish its elasto-plastic behavior.…”

Section: Fluid-structural Simulation Testmentioning

confidence: 99%

“…Tiftikçi et al [18] and Wei et al [19] conclude that the Reynolds average Navier-Stokes (RANS) models, using the Boussinesq eddy viscosity hypothesis, fail to take into account an isotropic eddy viscosity, as it does not fully reflect reality. Thus, they are not suitable to calculate turbulence or anisotropic flows.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Comparative Study of Turbulence Methods Applied to the Design of a 3D-Printed Scaffold and the Selection of the Appropriate Numerical Scheme to Simulate the Scaffold for Tissue Engineering

Suffo

López-Marín

2021

Applied Sciences

View full text Add to dashboard Cite

Current commercial software tools implement turbulence models on computational fluid dynamics (CFD) techniques and combine them with fluid-structural interaction (FSI) techniques. There are currently a great variety of turbulence methods that are worth investigating through a comparative study in order to delineate their behavior on scaffolds used in tissue engineering and bone regeneration. Additive manufacturing (AM) offers the opportunity to obtain three-dimensional printed scaffolds (3D scaffolds) that are designed respecting morphologies and that are typically used for the fused deposition model (FDM). These are typically made using biocompatible and biodegradable materials, such as polyetherimide (PEI), ULTEM 1010 biocompatible and polylactic acid (PLA). Starting from our own geometric model, simulations were carried out applying a series of turbulence models which have been proposed due to a variety of properties, such as permeability, speed regime, pressures, depressions and stiffness, that in turn are subject to boundary conditions based on a blood torrent. The obtained results revealed that the detached eddy simulation (DES) model shows better performance for the use of 3D scaffolds in its normal operating regime. Finally, although the results do not present relevant differences between the two materials used in the comparison, the prototypes simulated in PEI ULTEM 1010 do not allow their manufacture in FDM for the required pore size. The printed 3D scaffolds of PLA reveal an elastic behavior and a rigidity that are similar to other prototypes of ceramic composition. Prototypes made of PLA reveal unpredictable variability in pore and layer size which are very similar to cell growth itself and difficult to keep constant.

show abstract

Section: Selection Of the Fsi Calculation Methodsmentioning

confidence: 95%

Section: Fluid-structural Simulation Testmentioning

confidence: 99%